Cut-off valve for centrifugal pumps.



S. V. TRENT.

CUT-OFF VALVE FOR GENTRIFUGAL PUMPS.

APPLICATION FILED JAN. 6, 1908. 93 m 6., ylmentedl May 18, 1909.

2 SHEETS-SHEET 1.

.BYl

S. V. TRENT.

GUT-OFI' VALVE POR GENTRIFUGAL PUMPS.

APPLICATION FILED JAN. 6, 1808.

921 ,91' 6. i q Patented May'ls, 1909.

2 SHEETS-SHEET 2.

A TTORNE Y.

fvalve, foru controlling the vo sIMEoN v. TRENT, oF sALTLAKE CITY, UTAE.

GUT-OFF VALVE FOR CENTRIFUGAL PUMPS.

specincation of Letters Patent.

Patented May 18, 19.09;.

Application led January 6, 1908. Serial No. 409,563.

Tocll whomeit may concern:

Be it known that I, SIMEON V. TRENT, a resident of Salt Lake City, SaltLake county, State of Utah, have invented a new. and useful Improvementin Centrifugal Pum s Used for Pumping Liquids, of which the fdllowing isa specification.

My invention isA anv adjustable cut ofi ume of water de'- livered by acentrifugal 'or turbine pump, and can be adjusted either whenthe pump isat rest or in operation. s he intention of the partial view of acentrifugal pum ring out more particularly the portlon of the pumpcalled its suction passage, which is the passage connectin the usualvertical suction pipe with the inta e or suction connection to the pumpitself., f

Figure il is an outside elevation with a portion cutayvay to show `aportion of the means for operating the valve. Fig. #2 is an outside endview (of the same pdrtion ofthe pump showing a flange by means of whichthe usual suction pipe or elbow is connected to the suction passage ofpum this flange connection showing 12 bolts. EIhe'top portion of theview re resents the end view of the valve chest.) ig. #3 is alongitudinal section and a portion of the pump impeller.

. Fig. #4 is a vertical transverse section on the line X X of Fig. SrandFig. 1. j This invention isbased u on the welldemonstrated principlethat' t e capacity of any turbine or centrifugal pump 1s deter'y minedin the first instance by the cruoss-section or area of the intakepassage or assages formed by or in the pum impe er, conquently a methoddevised W 'ch successfully enlarges or restricts the area of thosepassages must vary accordingly the volume of water which the pump willdeliver. This, of course, is quite apart from consideration of the speedWhich is the second factor in determining the volume of water delivered.

In Fig. #3 is shown a vertical section view of the suction passage A ofa centrifugal 1Lum The inside of. this suction passage is tte with-anindependent lininglpr cylinder B, of corresponding shape. T 's internalcylinder is provided with means for its artial rotation, the rotationbeing effecte 1n such a manner thatin addition to partly rotating orrevolving ythis cylinder it propels it forwardA toward the other head ordrive head of the pump.

. once commences to partly drawings' is to show a. and to In doing thisit at the valve cy shut off the intake to the passages M throng theimpeller L and il' this motion is continued far enough it will inallclose said intake passage com letely, there y causing the pump to ceasede "vering water. This valve cylinder is made so as to move freelyinside of the suction passage and is, ofcourse., concentric with it.

The combined rotary and forward movement'of this cylinder isaccomplished in the following man-ner: In the first place, there is avalve chest orchamber C, cast integral with the suction chamber but ontop of it and having its own independent and removable cap or cover C.Screwed into the to side of the valve cylinder B, are two vertica pinsD,- D. Lying crosswise and each side of these two vertical ins D, D, aredisposed two horizontal bars E. These two bars are carried in a nut F,which nut is provided with a transverse threaded hole G, and i'spropelled backward and forward by means of the screw upon the horizontalvalve shifter H, en aging the threads in nut F. When so prope led thesehorizontal bars E, E, throw the vertical pins D D, backward or forwardfrom their vertical' position which produces the revolv- B. Said slotsbeing so disposed .that when the valve cylinder B begins to revolve itis at,

the sameotime forced forward toward the center of the impeller L, bymeans of the slots pressing agamst the two fixed pins I, I, whichproject through the walls of the suction passage A. In this way anymechanism or obstruction to the interior of the rsuction passage isentirely avoided, and the mechanism for actuating the valve is assembledin the valve chest C above the suction chamber and entirely out of thecourse of the flow of water through the pump.

The horizontal and threaded valve shifter H whose end projects throughthe valve chest is of course properly fitted with a stuffing boX Kinorder to prevent any possibility of a` leakage of air into 'the valvechest and thence into the suction passage, which, if it occurred, would,of course, interfere with the successful operation of the pump.

The method herein described and illustrated simpllyshows one methodl ofoperating inder. Other means may be devised for imparting a similarmovement to the cylinder and IV do not lrestrict the ap,- plication ofthis valve to any particular form of actuating mechanism but claim,broadly,

the application of a valve of this typev or form y no matter howactuated as applied to all cen-l A trifugal pumps. l

Having thus described my invention I desire to secure by LettersPatent- 1. The combination with a centrifugal pum having a suctionpassage and a rotary impe er provided with a suctlon recesscommunicating with the suction passage, said impeller having dischargepassages extending outwardly from said suction recess, of.

means for enlarging or restricting the area of 4 the receiving ends ofthe discharge passages of the impeller. A

2. The combination with a centrifugal pum having a suction passage and arotary impe ler providedwith-a suction recess communicating with thesuction passage and having discharge passages extending outwardly fromsaid suction recess, of valve mechanism consisting of a valve mounted inthe suction passage and movable in the suction recess of the impeller toenlarge or restrict the area of the receivin ends of the dischargepassages of the impe er.

3. In combination with a centrifugal -pump embodying a suction passageand a rotary impeller having a suction recess from which outwardlyextend discharge passages, a cylindrical valve arranged in the suctionpassage and extending into the suction recess, a spiral pin and slotconnection between the valve and wall of the suction passage, the

suction passage having a slot in a side thereof, a projection on thevalve extending through saidv slot, a bar arranged at an angle to theprojection aforesaid, and a screw operatively connected with the bar tomove the 'same in engagement with the Cprojection on the valve, wherebyrotary an longitudinal movement of the valve may be eected.

4. In combination with a centrifugal pump comprising a suction passageand a rotary impeller, the latter being formed with a suction recesscommunicating with the suction passage andhaving outwardly extendingdischarge passa es leading from said recess, a

casing applie te the outer wall of the suction recess, a valve mountedin the suction passage and having one endextending into the suctionrecess of the impeller, a s iral pin and slot connection between the vave and the wall of the suction passage, projections extending from thevalve through the wall of the suction"passage into the casing aboverewithin the'suction passage and providedA with a slot in itsl wallinclinedto a line parallel with the axis, of a stationary pin extendininto the slot, a projection attached to the cy inder, two barsto operatethe projection in a direction transverse to the axis, a member carryingthe bars, and a shifter to operate 'said member.

, SIMEON V. TRENT.

Witnesses: l

W., D. MULLoY, F. H. PEYTON.

